The judges were given the categories they'll be mentoring for the rest of the season and told which superstar guest would join each judge during the "Judges' Homes" round of the competition. Tonight (8, Fox) the 24 acts that made it to the "Judges' Homes" round will continue vying for their spot on the live shows, which kick off Nov. 1. But first, on Wednesday at 8 p.m., the judges will make more cuts, each revealing four acts that will continue and two that will be eliminated.

Simon Cowell, who will mentor Groups, was joined by Marc Anthony. (They lounged in the backyard at Simon's Miami mansion.)

Demi Lovato (in her L.A. loft), set to mentor Young Adults (17-24), was paired with Nick Jonas.

L.A. Reid, who will mentor Over 25s (25 & up), was accompanied by Justin Bieber and talent manager Scooter Braun.